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HD 188753 is a triple star system located approximately 149 light years away from Earth in the constellation Cygnus. The system also contains a "hot Jupiter" -type planet orbiting the primary star. The system is also known as ADS 13125, Ho 581, BD+41°3535 [1] [2], HIP 98001, and WDS 19550+4152 [3]. This star system is only the second triple-star system known to have a planet orbiting it [4], HD 188753 Ab, which was discovered in 2005 by Polish astronomer Dr. Maciej Konacki. Image File history File links HD1888753ab. ...
Image File history File links HD1888753ab. ...
NASA Logo Listen to this article · (info) This audio file was created from the revision dated 2005-09-01, and does not reflect subsequent edits to the article. ...
A triple star system consists of three gravitationally bound stars. ...
A star system or stellar system is a system comprised of a star or group of stars, with possibly planetary systems of smaller bodies (such as planets or asteroids), in close gravitational association. ...
A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ...
Earth, also known as Terra, and Tellus mostly in the 19th century, is the third-closest planet to the Sun. ...
Orion is a remarkable constellation, visible from most places on the globe (but not always the whole year long). ...
Cygnus (Latin for swan) is a northern constellation. ...
Artists impression of roaster extrasolar planet HD 209458b (Osiris). ...
In astronomy, many stars are referred to simply by catalogue numbers. ...
In astronomy, many stars are referred to simply by catalogue numbers. ...
Hipparcos (for High Precision Parallax Collecting Satellite) was an astrometry mission of the European Space Agency (ESA) dedicated to the measurement of stellar parallax and the proper motions of stars. ...
In astronomy, many stars are referred to simply by catalogue numbers. ...
Triple sunset - artist concept (Credit:NASA/JPL-Caltech) HD 188753 Ab is the first known planet in a triple star system. ...
2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ...
Dr. Maciej Konacki Dr. Maciej Konacki (MATCH-ee Konn-ATZ-kee) (b. ...
History
 The position of HD 188753 in the Cygnus constellation; the star is not visible to the naked eye. The system's combined visual magnitude is +7.43, too faint for the naked eye but easily picked out with a small telescope. Its visual duplicity was discovered in 1895 by George Washington Hough (who put it down in his catalogue as Ho 581). The J2000.0 co-ordinates are right ascension 19 h 54 min 58.4 s, declination +41°52'18''. Image File history File links Download high resolution version (879x675, 19 KB)This is a finding chart for HD 188753. ...
Image File history File links Download high resolution version (879x675, 19 KB)This is a finding chart for HD 188753. ...
Cygnus (Latin for swan) is a northern constellation. ...
The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ...
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50 cm refracting telescope at Nice Observatory. ...
1895 was a common year starting on Tuesday (see link for calendar). ...
The J2000. ...
Right ascension (RA; symbol α: Greek letter alpha; celestial longitude) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. ...
In astronomy, declination (dec) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. ...
Stars The primary star (HD 188753 A) is a 1.06 solar mass G-type (yellow dwarf). In astronomy, the solar mass is a unit of mass used to express the mass of stars and larger objects such as galaxies. ...
Large solar flare recorded by SOHO EIT304 instrument in the ultraviolet. ...
Orbiting this at a distance separated from the primary star at approximately midway between the Sun-Saturn and Sun-Uranus distance: 12.3 AU, are two stars orbitting each other. These have a total mass of 1.63 solar masses and orbit the primary with an eccentricity of 0.50 (an earlier estimate put the eccentricity at 0.26±0.07 [5]). They orbit each other in 156 days, and circle the main star every 25.7 years [6]. An approximation is an inexact representation of something that is still close enough to be useful. ...
The Sun (or Sol) is the star at the center of our Solar system. ...
Adjective Saturnian Atmospheric characteristics Atmospheric pressure 140 kPa Hydrogen >93% Helium >5% Methane 0. ...
The Sun (or Sol) is the star at the center of our Solar system. ...
Adjective Uranian Atmospheric characteristics Atmospheric pressure 120 kPa (at the cloud level) Hydrogen 83% Helium 15% Methane 1. ...
The astronomical unit (AU or au or a. ...
Eccentric is from the Greek for out of the centre, as opposed to concentric, in the centre. ...
The secondary (HD 188753 B) has a spectral class of K (orange dwarf), and the tertiary (HD 188753 C)is an M-type (red dwarf). These orbit each other in 156 days, and the primary in 25.7 years.[7] Orange dwarfs are main sequence stars of spectral type K. Categories: Star stubs | Orange dwarfs ...
Red Dwarf is a science fiction British sitcom (or Britcom for short). ...
Planet - Main article: HD 188753 Ab
Dubbed HD 188753 Ab, the planet orbits the primary in 3.3 days [8], and is a "hot Jupiter" (gas giant). In geometry, the term semi-major axis (also semimajor axis) is used to describe the dimensions of ellipses and hyperbolas. ...
The astronomical unit (AU or au or a. ...
In astrodynamics, under standard assumptions any orbit must be of conic section shape. ...
The orbital period is the time it takes a planet (or another object) to make one full orbit. ...
A day (symbol: d) is a unit of time equal to 24 hours. ...
Inclination is one of the six orbital parameters describing the shape and orientation of a celestial orbit and is the angular distance of the orbital plane from the plane of the reference (usually planets equator or the ecliptic), stated in degrees. ...
Map of Earth showing lines of longitude, which appear curved and vertical in this projection, but are actually halves of great circles Longitude, sometimes denoted by the Greek letter λ, describes the location of a place on Earth east or west of a north-south line called the Prime Meridian. ...
Another view of Keplerian orbital elements. ...
Another view of Keplerian orbital elements. ...
The Julian day or Julian day number (JDN) is the number of days that have elapsed since 12 noon Greenwich Mean Time (UT or TT) on Monday, January 1, 4713 BC in the proleptic Julian calendar . ...
Mass is a property of physical objects that, roughly speaking, measures the amount of matter they contain. ...
Atmospheric characteristics Atmospheric pressure 70 kPa Hydrogen ~86% Helium ~14% Methane 0. ...
In classical geometry, a radius of a circle or sphere is any line segment with one endpoint on the circle (i. ...
Density (symbol: Ï - Greek: rho) is a measure of mass per unit of volume. ...
The international prototype, made of platinum-iridium, which is kept at the BIPM under conditions specified by the 1st CGPM in 1889. ...
The cubic metre (symbol m³) is the SI derived unit of volume. ...
Temperature is the physical property of a system which underlies the common notions of hot and cold; the material with the higher temperature is said to be hotter. ...
The kelvin (symbol: K) is the SI unit of temperature, and is one of the seven SI base units. ...
Dr. Maciej Konacki Dr. Maciej Konacki (MATCH-ee Konn-ATZ-kee) (b. ...
2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ...
Triple sunset - artist concept (Credit:NASA/JPL-Caltech) HD 188753 Ab is the first known planet in a triple star system. ...
References - Griffin, R.F., The multiple star HD 188753 (ADS 13125), The Observatory, Vol. 97, pp. 15-18, 1977
- Bowman, Lee (Jul. 14, 2005). "Planet with a view: Three suns shine in Cygnus". The Plain Dealer, pg. A2.
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